Having grown up in the north suburbs of Chicago, I understand cold. But now Florida and since I work out of my residence, the continued (but limited) operation of the garage door is essential (That is if I want to stay married). I envy those like you that have a separate building on their property.
With that said, it is still a good idea to have some fresh air still able to enter the area. Since I do a bit of polishing and stoning. The smell of Kerosene can get to me after a while. Every time that Kerosene smell permeates the air, it makes me think of how the early pioneers had contend with the smell daily. It reminds me of my Great Grandmother telling me about when she was a kid reading at night while sitting next to a kerosene lantern.